Method subtractTypeSetFrom

source/python.js:10900–10914

(to_subtract, from)

                return torch.OptionalType.create(contained_types[0]);
            }
            subtractTypeSetFrom(to_subtract, from) {
                const types = [];
                const should_subtract = (lhs) => to_subtract.some((rhs) => lhs.isSubtypeOf(rhs));
                for (const t of from) {
                    if (!should_subtract(t)) {
                        types.push(t);
                    }
                }
                if (types.length === 0) {
                    return null;
                } else if (types.length === 1) {
                    return types[0];
                }
                return torch.UnionType.create(types);
            }
            str() {
                return `${this.getElementType().str()}?`;
            }